Hi Sushma Nayak,
I think Nested Sorting is the right feature to use!
Please read the page about Nested Sorting, and check the .twbx I've attached to my post.
I have combined the Subcategory and Region, then disabled "Show Header" on the latter. I have added Subcategory to displays the subcategories: It makes the viz easier to read.
Is this what you were looking for?
FilteringTest-1.twbx 385.5 KB